问题记录：GateWay启动报错 （转载），记录下解决方法

版本：

• SpringCloud： Hoxton SR6

• GateWay：2.2.4 其它版本也一样（2.x）

• SpringBoot：2.2.1

依赖：

<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-consul-discovery</artifactId>
        <exclusions>
            <exclusion>
                <artifactId>jsr305</artifactId>
                <groupId>com.google.code.findbugs</groupId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-gateway</artifactId>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
    </dependency>
</dependencies>
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启动直接报错：

Correct the classpath of your application so that it contains a single, compatible version of reactor.netty.resources.ConnectionProvider

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-06-30 17:35:32.552 ERROR 67984 --- [  restartedMain] o.s.b.d.LoggingFailureAnalysisReporter   : 

APPLICATION FAILED TO START

Description:
An attempt was made to call a method that does not exist. The attempt was made from the following location:
org.springframework.cloud.gateway.config.GatewayAutoConfiguration$NettyConfiguration.gatewayHttpClient(GatewayAutoConfiguration.java:622)

The following method did not exist:
reactor.netty.resources.ConnectionProvider.elastic(Ljava/lang/String;Ljava/time/Duration;Ljava/time/Duration;)Lreactor/netty/resources/ConnectionProvider;

The method's class, reactor.netty.resources.ConnectionProvider, is available from the following locations:
jar:file:/E:/warehouse/io/projectreactor/netty/reactor-netty/0.9.1.RELEASE/reactor-netty-0.9.1.RELEASE.jar!/reactor/netty/resources/ConnectionProvider.class

It was loaded from the following location:
file:/E:/warehouse/io/projectreactor/netty/reactor-netty/0.9.1.RELEASE/reactor-netty-0.9.1.RELEASE.jar

Action:
Correct the classpath of your application so that it contains a single, compatible version of reactor.netty.resources.ConnectionProvider
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单独升级WebFulx和reactor-netty可以正常启动且访问正常

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webflux</artifactId>
    <version>5.2.7.RELEASE</version>
</dependency>
<dependency>
    <groupId>io.projectreactor.netty</groupId>
    <artifactId>reactor-netty</artifactId>
    <version>0.9.8.RELEASE</version>
</dependency>
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但运行过程中一直报如下错误

java.lang.NoSuchMethodError: org.springframework.http.server.reactive.ServerHttpResponse.setRawStatusCode(Ljava/lang/Integer;)Z

020-06-30 17:39:33.021 ERROR 63684 --- [ctor-http-nio-2] reactor.netty.http.server.HttpServer     : [id: 0xe544fb4b, L:/192.168.7.254:9527 - R:/192.168.7.254:61632] 
java.lang.NoSuchMethodError: org.springframework.http.server.reactive.ServerHttpResponse.setRawStatusCode(Ljava/lang/Integer;)Z

at org.springframework.web.reactive.function.server.DefaultServerResponseBuilder\(AbstractServerResponse.writeStatusAndHeaders(DefaultServerResponseBuilder.java:356) ~[spring-webflux-5.2.7.RELEASE.jar:5.2.7.RELEASE]
	at org.springframework.web.reactive.function.server.DefaultServerResponseBuilder\)AbstractServerResponse.writeTo(DefaultServerResponseBuilder.java:344) ~[spring-webflux-5.2.7.RELEASE.jar:5.2.7.RELEASE]

at org.springframework.boot.autoconfigure.web.reactive.error.AbstractErrorWebExceptionHandler.write(AbstractErrorWebExceptionHandler.java:311) ~[spring-boot-autoconfigure-2.2.1.RELEASE.jar:2.2.1.RELEASE]

at org.springframework.boot.autoconfigure.web.reactive.error.AbstractErrorWebExceptionHandler.lambda$handle\(2(AbstractErrorWebExceptionHandler.java:264) ~[spring-boot-autoconfigure-2.2.1.RELEASE.jar:2.2.1.RELEASE]
	at reactor.core.publisher.MonoFlatMap\)FlatMapMain.onNext(MonoFlatMap.java:118) ~[reactor-core-3.3.0.RELEASE.jar:3.3.0.RELEASE]

at ...
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最终解决方法就是将SpringBoot升级到最新版本2.3.1,一切正常

父依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-dependencies</artifactId>
    <version>2.3.1.RELEASE</version>
    <type>pom</type>
    <scope>import</scope>
</dependency>
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